Photographic apparatus



E. C. S. PARKER.

PHOTOGRAPHIC APPARATUS.

AFPLICATION FILED FEB. I2. 1920- 7 2 a 7 1,341,338. Patented May25,1920. X 02' 6 Q l I I l '4 1Z1 fa 1 "v W 1 1 I 7 UNITED STATES PATENTOFFICE.

EDWARD C. S. PARKER, OF THE UNITED STATES NAVY.

PHOTOGRAPHIG APPARATUS.

Application filed February 12. 1920.

To all whom it may com-cm Be it known that I, EDWARD C. S. PARKER, ofthe l nited States Navy, a citizen of the United States, have invented acertain new and useful Improvement in Photographic Apparatus, of whichthe following is a specitication.

In U. S. Letters Patent No. 1,328,291, granted to me January 20, 1920, Ihave set forth a method and apparatus for producing photographs andprojecting the same in natural colors. and in U. S. Letters Patent Nos.1,328,292, 1,328,293 and 1,328,291, also ganted to me January 20, 1920,I have set forth photographic apparatus also embodying the aforesaidmethod-the said apparatus being, however, specifically different fromthe apparatus disclosed in my firstnamed Patent No. 1,328,291.

My present invention is another specifically different apparatusembodying said method, in which the construction is simplified andcheapened.

In the accompanying drawing- Figure 1 an optical diagram, showing thelenses and color filters in section, and as disposed in the apparatus.Figs. 3 and 1 are, respectively, plan views of the lenses A. and I3 andof the group of lenses C, D, E.

Similar letters of reference indicate like parts.

A is a spherical convex lens (here plano convex). B is a cylindricallens, here plano concave, the concavity being opposite to the convexityof lens A. C, D, E form a group of similar double convex cylindricallenses disposed edge to edge with their longitudinal axes parallel toone another and to the longitudinal axis of lens B. Said lenses C, D, Eare of shorter focal length than either lens A or B. F, G, H are lightfilters, each selective of a different color.

The light pencil coming from an object upon the lens A will be convergedupon the lens B, and there diverged to traverse the Specification ofLetters Patent.

I he filter wi l ittfiii'ttsereetivei Patented May 25, 1920.

Serial No. 358.103.

sitized sIide or fiII11-\V1ll be reduced in dimensions of each image will be gtift ey e rg to make the light traversing them free from the rayscomplementary in color to the color of the filters themselves. Theimages thus photographed upon the slide may then be projected bytransmitting the light through the apparatus in the reverse direction;that is, assuming the rays traversing the several photographs on thefilm to pass in the direction of the arrows Fig. 1, they willsuccessively traverse the filters F, G, H, lenses C, D, E, lens B andlens A, and finally be projected as a single picture on the screen I.The foci of the lens A and of the lenses 0, D, E and the virtual focusof lens B should be in the same plane.

I claim:

photographic apparatus of the type set forth. comprising in the ordernamed, a convex spherical lens, a concave cylindrical lens, a pluralityof convex cylindrical lenses of shorter focal length than either of saidbefore-named lenses disposed edge to edge with their lon itudinal axesparallel to one another and to the longitudinal axis of said concavelens, and color filters respectively transmitting the rays from saidplurality of convex cylindrical lenses to the image-receiving surface. 7

In testimony whereof I have affixed my signature in presence of twowitnesses.

EDIVARD C. S. PARKER.

Witnesses Gnnrncnn T. Pon'rnn. MAY T. MCGARRY.

